This region would also include Liechtenstein, which doesn´t have any airports (that I´m aware of).
It has:
Many international airports.
Many small airfields for the small propeller fans to enjoy.
Possibility of cruise flights of over 25000ft.
Tell me what do you think of it.
Airports in Northern Italy:
- Bolzano Airport, one asphalt runway, 01/19, 4245ft/1294m.
- Belluno Airport, one grass runway, 05/23, 2664ft/812m.
- Padua Airport, one asphalt runway, 04/22, 3681ft/1122m.
- Treviso Airport, one asphalt runway, 07/25, 7940ft/2420m.
- Treviso-Istrana Air Base, one asphalt runway, 08/26, 9817ft/2992m.
- Venice (Marco Polo) Airport, one asphalt runway and one bituminous runway, 04R/22L and 04L/22R, 10827ft/3300m and 9121ft/2780m respectively.
- Venice-Lido Airport, one grass runway, 05/23, 3261ft/994m.
- Verona-Villafranca Airport, one bituminous runway, 04/22, 10064ft/3068m, one concrete helipad, H1, 35x26ft/110x85m.
- Vicenza Airport, one asphalt runway, 18/36, 4921ft/1500m.
- Aosta Valley Airport, one asphalt runway, 09/27, 4916ft/1499m.
- Parma Airport, one asphalt runway, 02/20, 6962ft/2122m.
- Piacenza-San Damiano Air Base, one asphalt runway, 12/30, 9828ft/2996m.
- Aviano Air Base, one concrete runway, 05/23, 9800ft/2987m.
- Trieste-Friuli Venezia Giulia Airport, one asphalt runway, 09/27, 9843ft/3000m.
- Albenga Airport, one asphalt runway, 09/27, 4688ft/1429m.
- Genoa/Cristoforo Colombo Airport, one bituminous runway, 10/28, 9564ft/2916m.
- Il Caravaggio International Airport, two asphalt runways, 10/28 and 12/30, 9630ft/2934m and 2552ft/778m respectively.
- Brescia Airport, one asphalt runway, 14/32, 9810ft/2990m.
- Milan–Malpensa Airport, two asphalt runways, 17L/35R and 17R/35L, both of 12861ft/3920m.
- Milan-Linate Airport, one asphalt runway, one bituminous runway and one helipad, 18/36, 17/35 and H1, 8012ft/2442m, 1972ft/601m and 92ft/28m respectively.
- Bresso Airport, one runway, 18/36, 3534ft/1080m.
- Varese-Venegono Airport.
- Biella-Cerrione Airport.
- Cuneo International Airport, one asphalt runway, 03/21, 6903ft/2104m.
- Turin Airport, one asphalt runway, 18/36, 10827ft/3300m.
- Turin-Aeritalia Airport, one paved asphalt runway and two grass runways, 28R/10L, 28L/10R and 28/10, 3524ft/1074m, 2461ft/750m and 1640ft/500m respectively.
Southern Switzerland:
- Bern Airport, one asphalt runway and one grass runway, 14/32 and 14L/32R, 5676ft/1730m and 2133ft/650m respectively.
- Ambri Airport, one asphalt runway, 11/29, 6529ft/1990m.
- Buochs Airport.
- Interlaken Airport, one tarmac runway, 05/23, 5433ft/1656m.
- Lausanne Airport, one asphalt runway, 18/36, 2542ft/775m.
- Locarno Airport, one bituminous concrete runway and two grass runways, 08L/26R, 08C/26C and 08R/26L, 2626ft/800m and both grass runways have 2560ft/780m.
- Lugano Airport, one asphalt runway, 01/19, 4658ft/1420m.
- Sion Airport, one asphalt runway and one grass runway, 07R/25L and 07L/25R, 6562ft/2000m and 1820ft/555m respectively.
- Samedan Airport, one asphalt runway, 03/21, 5905ft/1800m.
- Zürich Airport, three concrete runways, 10/28, 14/32 and 16/34, 8202ft/2500m, 10827ft/3300m and 12139ft/3700m respectively.
- St. Gallen–Altenrhein Airport, one asphalt runway and one grass runway, 10R/28L and 10L/28R, 4921ft/1500m and 1968ft/600m respectively.
- St. Stephan Airport.
- Saanen Airport.
- Geneva Airport, one concrete runway and one grass/earth runway, 05/23 and 05L/23R, 12795ft/3900m and 2700ft/823m respectively.
- Wangen-Lachen Airport, one asphalt runway 08/26, 1640ft/500m
- Mollis Airport, one asphalt (or concrete not sure) runway 01/19, 5900ft/1800m
- Ecuvillens Airport, one asphalt runway, 10/28, 2293ft/699m.
- Meiringen Airport, one asphalt runway, 10/28, 6571ft/2003m
- Dübendorf Aiport, one asphalt runway and one grass runway, 11/29 and 11R/29L, 7726ft/2355m and 2132ft/650m
- Payerne Air Base, one asphalt runway, 05/23, ???ft/???m.
Thanks to @JTV for airports 15 to 20.
Airports in Eastern Austria:
- Reutte-Höfen Airport, one grass runway, 04/22, 2310ft/704m.
- Hohenems-Dornbirn Airport, one asphalt runway, 05/23, 2080ft/634m.
- Innsbruck Airport, one asphalt runway, 08/26, 6562ft/2000m.
- Salzburg Airport, one concrete runway, 15/33, 9022ft/2750m.